A well-defined magnetic metal organic frameworks (MOFs)/graphene oxide (Fe₃O₄@HKUST-1/GO) consisting of magnetic Fe₃O₄ nanoparticles, HKUST-1 nanocrystal and GO was synthesized through a simple and environmentally friendly approach. Characterizations of Fe₃O₄@HKUST-1/GO adsorbing U(VI) with high-resolution transmission electron microscopy suggested that the Fe₃O₄@HKUST-1/GO possessed good stability. The introduction of GO enhanced the ability of particles to uptake U(VI) from aqueous solution. The effects of solution pH, contact time and temperature on U(VI) adsorption were systematically tested by intermittent experiments. The adsorption process can be better described by the Langmuir model and the pseudo-second-order kinetic model. The results showed that the Fe₃O₄@HKUST-1/GO exhibited good adsorption capacity towards U(VI) at the initial solution pH value of 4.0 and T = 318 K. The X-ray photoelectron spectroscopy was used to analyze the U(VI) removal mechanism. This work represents the application of Fe₃O₄@HKUST-1/GO as a novel adsorbent to extract U(VI) from contaminated water.

通过简单且环保的方法合成了由磁性Fe ₃ O ₄纳米颗粒，HKUST-1纳米晶体和GO组成的定义明确的磁性金属有机骨架（MOF）/氧化石墨烯（Fe ₃ O ₄ @ HKUST-1 / GO）。Fe ₃ O ₄ @ HKUST-1 / GO吸附U（VI）的高分辨率透射电子显微镜表征表明，Fe ₃ O ₄@ HKUST-1 / GO具有良好的稳定性。GO的引入增强了颗粒从水溶液吸收U（VI）的能力。通过间歇性实验系统地测试了溶液pH，接触时间和温度对U（VI）吸附的影响。吸附过程可以用Langmuir模型和伪二级动力学模型更好地描述。结果表明，Fe ₃ O ₄ @ HKUST-1 / GO在初始溶液pH值为4.0且T  = 318 K时对U（VI）表现出良好的吸附能力。X射线光电子能谱分析了U （六）清除机制。这项工作代表了Fe ₃ O ₄的应用@ HKUST-1 / GO作为一种新型吸附剂，可从受污染的水中提取U（VI）。